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Population Review

What is the largest county in Iowa?

Polk County is the largest county in Iowa with a population of 497,441, according to Census ACS 5-Year.

Context

Iowa has 99 counties.

Top 10

Polk County497,441
Linn County229,463
Scott County174,302
Johnson County154,881
Black Hawk County130,693

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Iowa full demographic profileCities in IowaAll US states

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Frequently Asked Questions

Polk County is the largest county in Iowa with a population of 497,441, according to Census ACS 5-Year.